diff --git a/History.markdown b/History.markdown
index 1f78cecb..92780830 100644
--- a/History.markdown
+++ b/History.markdown
@@ -13,6 +13,7 @@
   * Add a default charset to content-type on webrick. (#4231)
   * Switch `PluginManager` to use `require_with_graceful_fail` for better UX (#4233)
   * Allow quoted date in front matter defaults (#4184)
+  * Add a Jekyll doctor warning for URLs that only differ by case (#3171)
 
 ### Bug Fixes